Thank you, you have put it well. By no means I'm nature-knows-best person. But in this case nature does a great job in 'removing' CO2 by expending the least energy, with the least negative impact (actually a net positive) to the environment. Of course it's more nuanced than what even I stated. A wise engineer realizes the breadth of the issues and the 'true' engineering approach IMO will necessarily involve ( but not limited) a lot of trees/plants/algae etc.